Weighing-machine.



K. BTTGHER. WEIGHING MACHINE. APPLICATION FILED DBO. 1s, 1907.

928,491. j?? Patented July 20,1909.

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KARL BTTOHER, OF BERLIN, (GERMANY.

WEIGHING-MACHIN E Specification of Letters Patent.

Patented J'uly 20, 1909,

Application led December 16, 197. Serial No. 406,689.

To all whom it 'may concern:

Be it known that I, KARL BTTCHER, a subject of the King 0f Prussia, residing at Berlin, in the Kingdom of Prussia, German Empire, have invented certain new and useful Improvements in Veighing-Machines; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appert-ains to make and use the same.

The subject of my invention is a weighing machine which renders the use of numerous weights superfluous, whereby much time is saved.

My new machine diifers from prior weighing machines in which a number of weights are dispensed with, inasmuch as 1 employ a movable balance-point for the scale-beam, while the previous machines have a sliding weight on the scale-beam. Vith my method it is not necessary, as with prior apparatus, first to adjust a heavy weight and then to obtain the decimals by using a small weight.

The whole procedure of weighing on my method consists simply in moving the balance-point of the scale-beam into that position in which the scale-beam lies horizontally, and in then reading oft1 the weight on a scale.

My invention is illustrated in the accompanying drawing, in which- Figure l is an elevation, Fig. 2 a plan, Fig. 3 a fragmental longitudinal section, drawn on an enlarged scale, and Fig. 4 a cross section on the same scale as Fig. 3.

The machine is constructed as follows The scale-pan 1 and the weight 22 are secured to the scale-beam 2, one at each end. The beam 2 is connected by means of two bars 20, 21 with a rack 13, the points of connection 23, 24, 25, 26 being of the construction common to weighing apparatuses in which a minimum amount of friction is aimed at. The beam 2 serves partly as a guide for the dovetailed block 5 and partly as a rack 3. The dovetailed block 5 has a conical recess or crater 6 to receive the balance-point 27for the beam 2. This point 27 is the, apex of the support 9, whose base slides in a guideway 15 in the framework of the machine. This support receives the bearing-pins 11 and 12 of the toothed wheels 7 and 8, which gear with each other. The upper wheel 7 also meshes partly with the rack 3 of the beam 2 and partly with the stationary rack 4 of the framework, which latter raokis parallel with the scale-beam in the horizontal position of the latter. The lower toothed wheel 8 meshes with the rack 13, connected as already described with the beam 2. The rack 13, beam 2, and bars 20, 21, it will be observed, constitute a parallelogram. The rack 13 is balanced on a semi-cylindrical block 1l, which forms the foot of the support 9 and slides in the guideway 15.

The toothed wheels 7, 8 can have bearings on both sides, the one bearing-pin being mounted in the support 9, while the other runs in a horizontal guideway in the framework. The latter has a threaded hole 10, through which there passes a screw-spindle 19, mounted at 18 in the end 17 of the framework. The screw-spindle has hand-wheel 19, by turning which the support can be caused to t avel forward and backward in the guideway 15, carrying with it the toothed wheels 7, 8, and the dovetailed block 5 in which the balance-point 27 is accommodated.

The machine is used in the following manner The substance whose weight is to be determined is placed in the scale-pan 1 and the handle 19 turned until the beam 2 lies horizontally. The weight can then be read off on ascale which is fixed to the frame-- work, each position of the support 9 corresponding, when the beam 2 is in horizontal position, with a certain weight of the substance in the pan 1. 1f decimal readings are required, a circular scale may be provided. for the traversing-screw 16.

Having thus described my invention, lf declare that what I claim is- 1. A weighing machine, comprising, in combination, a framework whose base presents a guideway, a support having a tapped hole sliding in said guideway and presenting a balance-point above and a balance-foot below, a terminally weighted beam carrying a pan and presenting a dovetailed guideway and a rack, a second rack balanced on the foot of the support, arms jointing the two racks together, intermeshing' gears mounted on the support and engaging one with each rack, a recessed and dovetailed block sliding in the guideway of the beam and accommodating and resting on the balance-point of the support, and a traversing-screw mounted in the framework and passing through the hole in the support, substantially as described.

2. A weighing machine, comprising, in combination, a framework whose top pre-- sente a rack und whose base presents a guide-- way, a lSupport having u tapped hole slid-- ing in said guidewzry 2nd presenting a bal-- :nice-point above and a balance-foot below, n terminally weighted horizontal beam 4our rying u pan :1nd presenting a dovetailed guideway und a rack lying liush with the first Suid rack, a third rack balanced on the toot of the Supporx, arms jointing the last Suid rack with the beam-rack, intermeShing genre mounted on the support and engaging one with the 'Framework und beam-rocks and the other with the third rack, a recessed and dovetailed block sliding in the guideway of the. beam and accommodating and resting on the balancepoint or' the Support, and a traversing-screw mounted in the framework und passing through the hole in the Support, substantially as described. A

In testimony whereof I my signature in presence of two witnesses.

KARL BTTCHER.

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